Yea, square taper Shimano's UN Type Cartridge BB are disposably Cheap. adequately sealed ..

I liked the cheaper Campag square Taper cartridge BB as I Could slip a O ring on the spindle before I slipped
on the crankarms , to make a second water seal ..

I replaced the pricier model which uses the spline tool off the cassette lock ring to secure it.
So adding of O ring trick was not something working so well.. hard to pry them out of the hole.

external BB types seem to contaminate with road grime from the front wheel..

So mudguards Essential , or just plan to replace the bearing assemblies occasionally.


Ive Been using the Grease guard WTB licensed to Sun Tour.. new grease out of needle ***

pushes out the old. but it's NOS from a long time ago .